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208 sub _zero1522 my $last = _zero();1523 my $lastlast = _zero();1662 $x = _zero();1690 return _zero() if _acmp($c,$x,$y) == 0; # shortcut (see -and)1697 $x = _zero();1733 $x = _zero();1842 my $x = _zero();1884 my $u = _zero($c); my $u1 = _one($c);1997 _zero() return a new object with value 0